Year 7 · Mathematics and statistics · Number
Primes, factors, HCF and LCM
Prime and composite numbers, divisibility rules, highest common factors, lowest common multiples, squares and square roots.
Everything for this topic in one place
- 3D lesson: Primes, factors, HCF and LCM — Sieve a field of number stones for primes, rearrange cubes into factor-pair rectangles, test divisibility rules, find HCF and LCM, and build square numbers.
- Teacher presentation — slides to put on the projector.
- Worksheets at three levels — Tūī (support), Kererū (core) and Kea (extension), each with an answer key on the last page.
- Online practice — assign it to your class in the Crateclass classroom and the results come back by themselves.
Written for Te Mātaiaho, Phase 3 (Years 7–8), with New Zealand places, money and native birds.
Try before you sign up
See a full 3D lesson, a game and printable worksheets with no account on the free samples page. Teachers who sign up by 18 December 2026 get everything free until 9 April 2027.
More Year 7 maths topics
Powers of 10 and expanded form · Integers · Rounding, estimation and order of operations · Fractions, decimals and percentages · Proportional reasoning, percentages and money · Algebraic notation and equations · Linear patterns and the coordinate plane · Perimeter, area and volume formulae · Triangles and angles in polygons · Transformations, nets and compass points · Statistical investigations, averages and graphs · Experimental and theoretical probability